textinput: improve stemming

Fix cursor index after stemming and reset it to the position where the
completion should occur. Only stem to add more information and not
remove any user input.

Stemming is activated on the textinput line when the user presses the
Tab key. The idea of stemming is to adjust the textinput line to the
common ground (="the stem") of the completions options.

When the stemmed input line is set, however, the cursor will be moved to
the end of the line if there is a text part on the right side of the
cursor where the completion should occur. Another Tab press will
activate the onStem function again, which then removes the right part of
the text input leading to the loss of the user input.

This can be prevented by moving the cursor to the place of the
completion after stemming.

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

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